I heard there's hormonal pills for hirsutism. ..excessive hair growth, i'm black and i was wondering do these pills stop hair growth on head as well?

No: No, they work on the areas where the hair follicle is sensitive to (male) hormones by inhibiting the effect of testosterone which accelerates growth. In the case of the head (scalp) hair the excessive testosterone effect leads to hair falling (androgenetic alopecia) and this can be mitigated by the anti hirsutism pills. Thus these pills would slow head hair falling, not slow hair growth on head.